ZN infomarmation

This information guides you through the properties, benefits and uses for the materials we work with. We are always happy to discuss your needs and the solution that will work best for you and your products.

ZN Information
Zinc Alloy ZA2 – with a high tensile strength, ZL2 is a Zinc based alloy which can be used for hot chamber pressure diecast components or gravity casting. Used for small castings where hardness and high tensile strength are essential, the high copper content of this alloy can reduce the dimensional stability. ZL 2 also suffers from a severe loss of ductility during ageing and should be avoided if post forming of the casting is envisaged. When designing a stressed component using ZL2 further reference should be made to the alloys properties, at elevated temperatures, after natural or artificial ageing and the alloys creep properties.

Alloy Designation ZnAL4Cu3 Colour code White + Green.
Short designation ZL 2 Alloy Number. ZL0430

MECHANICAL PROPERTIES

Supplied in diecast form. As Cast Aged
Tensile strength 404 MPa 310 MPa
Yield strength 320 MPa 241 MPa
Impact strength 29 Joules 19 joules
Elongation 50mm 4-7% 10%
Shear strength 296 MPa 234 MPa
Compressive yield 269 MPa 183 MPa
strength
Fatigue Strength
Hardness BHN 500Kg 105 max 91 max

PHYSICAL PROPERTIES

Melting range 374 – 404 deg C
Density 6.0 g / cm 3
Coefficient of Thermal expansion 27.4 um/m deg C
Thermal Conductivity 109 W/m deg C
Electrical Conductivity 26 % IACS
Electrical Resistivity 6.5359 u ohm-cm at 20
deg C

Zinc Alloy ZA3 – a general purpose alloy, ZL3 is primarily used for producing castings for a variety of applications on a hot chamber pressure diecasting machine. The alloy’s mechanical and physical properties make it ideal for use in castings for the engineering and automotive industry, household equipment and utensils, office equipment, builders’ hardware, locks and toys. ZL3 is easily machined, buffed, polished, lacquered and electroplated for decorative or functional purposes. When designing a stressed component using ZL3 designers should refer to the alloy’s properties, at elevated temperatures, after natural or artificial ageing and the alloy’s creep properties.

Alloy Designation ZnAL4 Colour code White + Yellow
Short designation ZL 3 Alloy Number. ZL0400

MECHANICAL PROPERTIES

Supplied in diecast form. As Cast Aged
Tensile strength 283 MPa 241 MPa
Yield strength 221 MPa
Impa ct strength 58 Joules 56 Joules
Elongation 50mm 10% 16%
Shear strength 214 MPa
Compressive yield strength 413 MPa – MPa
Fatigue Strength 48
Hardness BHN 500Kg 82 max 72 max

PHYSICAL PROPERTIES

Melting range 381 – 387 degC
Density 6.7 g / cm 3
Coefficient of Thermal expansion 27.4 um/m deg C
Thermal Conductivity 113 W/m deg C
Electrical Conductivity 27 % IACS
Electrical Resistivity 6.3694 u ohm-cm at 20 degC

Zinc Alloy ZA5 – ZL5 is generally used for castings that require moderately higher strength and hardness and where dimensional stability is not an important criterion in the product application. ZL5 is often specified for automotive applications in Europe. The alloy contains copper as specified alloying element, this promotes marginally better casting properties than the ZL3 alloy and improves mechanical properties. The nominal 1% makes the alloy more expensive and therefore its use should be restricted to applications requiring its higher properties. ZL5 will accept any finish specified for ZL3. When designing a stressed component using ZL5 further reference should be made to the alloys properties, at elevated temperatures, after natural or artificial ageing and the alloys creep properties.

Alloy Designation ZnAL4Cu1 Colour code White + Black
Short designation ZL 5 Alloy Number. ZL0410

MECHANICAL PROPERTIES

Supplied in diecast form. As Cast Aged
Tensile strength 328 MPa 269 MPa
Yield strength 221 MPa
Impa ct strength 65 Joules 54 Joules
Elongation 50mm 7% 13%
Shear strength 262 MPa
Compressive yield strength 599.8 MPa
Fatigue Strength 56 MPa
Hardness BHN 500Kg 91 max 80 max

PHYSICAL PROPERTIES

Melting range 380 – 386 deg C
Density 6.7 g / cm 3
Coefficient of Thermal expansion 27.4 um/m deg C
Thermal Conductivity 109 W/m deg C
Electrical Conductivity 26 % IACS
Electrical Resistivity 6.5359 u ohm-cm at 20 deg C

Zinc Alloy ZA8 – ZL8 is designed to extend the application range of zinc alloy diecastings. In the past zinc alloys were considered unsuitable for applications where moderate stress was anticipated at elevated temperatures. ZL8 was specifically developed to improve the creep resistance and offer the best creep resistance of all the pressure diecasting alloys. It should be specified for structural or stressed applications for which other zinc alloys would be unsuitable. Although the strongest of the hot chamber alloys, it all has all of the properties associated with zinc diecasting alloys. The combination of higher strength, excellent dimensional stability, good surface finish and definition make it ideal for visible stressed parts which are subject to elevated temperatures during service. Finishes suitable for traditional pressure diecasting alloys can be applied to ZL8 castings with the same excellent results.

Typical applications for this alloy are under bonnet automotive parts, stressed parts for hazardous or mining applications, stressed electrical or computer parts microwave guides etc.

When designing a stressed component using ZL8 further reference should be made to the alloys properties, at elevated temperatures, after natural or artificial ageing and the alloys creep properties.

Alloy Designation ZnAL8Cu1 Colour code White + Blue
Short designation ZL 8 Alloy Number. ZL0810

MECHANICAL PROPERTIES

Supplied in diecast form. As Cast Aged
Tensile strength 374 MPa 297 MPa
Yield strength 290 MPa 225 MPa
Impact strength 42 Joules 17 Joules
Elongation 50mm 8% 20%
Shear strength 276 MPa 227 MPa
Compressive yield strength 252 MPa 171 MPa
Fatigue Strength 103 MPa
Hardness BHN 500Kg 106 max 91 max

PHYSICAL PROPERTIES

Melting range 374 – 404 deg C
Density 6.3 g / cm 3
Coefficient of Thermal expansion 27.4 um/m deg C
Thermal Conductivity 109 W/m deg C
Electrical Conductivity 26 % IACS
Electrical Resistivity 6.5359 u ohm-cm at 20 deg C